package com.kexio.config.service.impl;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.stereotype.Service;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.kexio.common.dto.Result;
import com.kexio.config.entity.SystemConfig;
import com.kexio.config.manager.ConfigManager;
import com.kexio.config.service.ConfigService;

import cn.hutool.core.util.StrUtil;

/**
 * 配置服务实现
 * 
 * @author Kexio Team
 * @since 1.0.0
 */
@Service
@ConditionalOnProperty(prefix = "kexio.config", name = "enabled", havingValue = "true")
public class ConfigServiceImpl implements ConfigService {
    
    private static final Logger logger = LoggerFactory.getLogger(ConfigServiceImpl.class);
    
    @Autowired
    private ConfigManager configManager;
    
    private final ObjectMapper objectMapper = new ObjectMapper();
    
    @Override
    public String getString(String key, String defaultValue) {
        try {
            String value = configManager.getConfigValue(key);
            return StrUtil.isNotBlank(value) ? value : defaultValue;
        } catch (Exception e) {
            logger.error("获取字符串配置失败: key={}", key, e);
            return defaultValue;
        }
    }
    
    @Override
    public Integer getInteger(String key, Integer defaultValue) {
        try {
            String value = configManager.getConfigValue(key);
            return StrUtil.isNotBlank(value) ? Integer.valueOf(value) : defaultValue;
        } catch (Exception e) {
            logger.error("获取整数配置失败: key={}", key, e);
            return defaultValue;
        }
    }
    
    @Override
    public Boolean getBoolean(String key, Boolean defaultValue) {
        try {
            String value = configManager.getConfigValue(key);
            return StrUtil.isNotBlank(value) ? Boolean.valueOf(value) : defaultValue;
        } catch (Exception e) {
            logger.error("获取布尔配置失败: key={}", key, e);
            return defaultValue;
        }
    }
    
    @Override
    public Long getLong(String key, Long defaultValue) {
        try {
            String value = configManager.getConfigValue(key);
            return StrUtil.isNotBlank(value) ? Long.valueOf(value) : defaultValue;
        } catch (Exception e) {
            logger.error("获取长整数配置失败: key={}", key, e);
            return defaultValue;
        }
    }
    
    @Override
    public Double getDouble(String key, Double defaultValue) {
        try {
            String value = configManager.getConfigValue(key);
            return StrUtil.isNotBlank(value) ? Double.valueOf(value) : defaultValue;
        } catch (Exception e) {
            logger.error("获取双精度配置失败: key={}", key, e);
            return defaultValue;
        }
    }
    
    @Override
    public <T> T getObject(String key, Class<T> clazz, T defaultValue) {
        try {
            String value = configManager.getConfigValue(key);
            if (StrUtil.isNotBlank(value)) {
                return objectMapper.readValue(value, clazz);
            }
            return defaultValue;
        } catch (Exception e) {
            logger.error("获取对象配置失败: key={}, class={}", key, clazz.getName(), e);
            return defaultValue;
        }
    }
    
    @Override
    public String getRawValue(String key) {
        return configManager.getConfigValue(key);
    }
    
    @Override
    public Result<Boolean> setConfig(String key, String value) {
        return setConfig(key, value, "system");
    }
    
    @Override
    public Result<Boolean> setConfig(String key, String value, String modifier) {
        try {
            if (StrUtil.isBlank(key)) {
                return Result.error("配置键不能为空");
            }
            
            boolean result = configManager.setConfigValue(key, value);
            
            if (result) {
                logger.info("配置设置成功: key={}, modifier={}", key, modifier);
                return Result.success("配置设置成功", true);
            } else {
                return Result.error("配置设置失败");
            }
            
        } catch (Exception e) {
            logger.error("设置配置异常: key={}, modifier={}", key, modifier, e);
            return Result.error("设置配置异常: " + e.getMessage());
        }
    }
    
    @Override
    public Result<Boolean> batchSetConfig(Map<String, String> configs, String modifier) {
        try {
            int successCount = 0;
            int totalCount = configs.size();
            
            for (Map.Entry<String, String> entry : configs.entrySet()) {
                if (configManager.setConfigValue(entry.getKey(), entry.getValue())) {
                    successCount++;
                }
            }
            
            String message = String.format("批量设置配置完成: 成功%d个, 总计%d个", successCount, totalCount);
            logger.info("批量设置配置: modifier={}, {}", modifier, message);
            
            return Result.success(message, successCount == totalCount);
            
        } catch (Exception e) {
            logger.error("批量设置配置异常: modifier={}", modifier, e);
            return Result.error("批量设置配置异常: " + e.getMessage());
        }
    }
    
    @Override
    public Result<Boolean> deleteConfig(String key) {
        try {
            if (StrUtil.isBlank(key)) {
                return Result.error("配置键不能为空");
            }
            
            boolean result = configManager.deleteConfig(key);
            
            if (result) {
                logger.info("配置删除成功: key={}", key);
                return Result.success("配置删除成功", true);
            } else {
                return Result.error("配置删除失败");
            }
            
        } catch (Exception e) {
            logger.error("删除配置异常: key={}", key, e);
            return Result.error("删除配置异常: " + e.getMessage());
        }
    }
    
    @Override
    public boolean exists(String key) {
        return StrUtil.isNotBlank(configManager.getConfigValue(key));
    }
    
    @Override
    public SystemConfig getConfigEntity(String key) {
        // 这里应该从数据库查询完整的配置实体
        // 模拟实现
        String value = configManager.getConfigValue(key);
        if (value != null) {
            SystemConfig config = new SystemConfig();
            config.setConfigKey(key);
            config.setConfigValue(value);
            config.setConfigName(key);
            config.setConfigType("SYSTEM");
            return config;
        }
        return null;
    }
    
    @Override
    public Result<SystemConfig> saveConfig(SystemConfig config) {
        try {
            if (config == null || StrUtil.isBlank(config.getConfigKey())) {
                return Result.error("配置信息不完整");
            }
            
            boolean result = configManager.setConfigValue(config.getConfigKey(), config.getConfigValue());
            
            if (result) {
                logger.info("配置保存成功: key={}", config.getConfigKey());
                return Result.success("配置保存成功", config);
            } else {
                return Result.error("配置保存失败");
            }
            
        } catch (Exception e) {
            logger.error("保存配置异常: key={}", config != null ? config.getConfigKey() : "null", e);
            return Result.error("保存配置异常: " + e.getMessage());
        }
    }
    
    @Override
    public List<SystemConfig> getConfigsByType(String configType) {
        // 模拟实现
        List<SystemConfig> configs = new ArrayList<>();
        
        if ("SYSTEM".equals(configType)) {
            configs.add(createMockConfig("system.title", "Kexio管理系统", "系统标题", "SYSTEM"));
            configs.add(createMockConfig("system.version", "1.0.0", "系统版本", "SYSTEM"));
            configs.add(createMockConfig("system.author", "Kexio Team", "系统作者", "SYSTEM"));
        }
        
        return configs;
    }
    
    @Override
    public List<SystemConfig> getConfigsByGroup(String configGroup) {
        // 模拟实现
        return new ArrayList<>();
    }
    
    @Override
    public List<SystemConfig> getAllConfigs() {
        // 模拟实现
        List<SystemConfig> configs = new ArrayList<>();
        configs.addAll(getConfigsByType("SYSTEM"));
        configs.addAll(getConfigsByType("BUSINESS"));
        return configs;
    }
    
    @Override
    public List<SystemConfig> searchConfigs(String keyword) {
        // 模拟实现
        List<SystemConfig> allConfigs = getAllConfigs();
        List<SystemConfig> result = new ArrayList<>();
        
        for (SystemConfig config : allConfigs) {
            if (config.getConfigKey().contains(keyword) || 
                config.getConfigName().contains(keyword)) {
                result.add(config);
            }
        }
        
        return result;
    }
    
    @Override
    public Result<Boolean> refreshCache() {
        try {
            configManager.clearCache();
            logger.info("配置缓存刷新成功");
            return Result.success("配置缓存刷新成功", true);
        } catch (Exception e) {
            logger.error("刷新配置缓存异常", e);
            return Result.error("刷新配置缓存异常: " + e.getMessage());
        }
    }
    
    @Override
    public Result<Boolean> refreshCache(String key) {
        try {
            configManager.clearCache(key);
            logger.info("配置缓存刷新成功: key={}", key);
            return Result.success("配置缓存刷新成功", true);
        } catch (Exception e) {
            logger.error("刷新配置缓存异常: key={}", key, e);
            return Result.error("刷新配置缓存异常: " + e.getMessage());
        }
    }
    
    @Override
    public Map<String, Object> getConfigStatistics() {
        Map<String, Object> stats = new HashMap<>();
        
        // 模拟统计数据
        stats.put("totalConfigs", 15);
        stats.put("systemConfigs", 8);
        stats.put("businessConfigs", 5);
        stats.put("userConfigs", 2);
        stats.put("cacheHitRate", "85%");
        
        return stats;
    }
    
    @Override
    public List<SystemConfig> exportConfigs(String configType) {
        if (StrUtil.isNotBlank(configType)) {
            return getConfigsByType(configType);
        } else {
            return getAllConfigs();
        }
    }
    
    @Override
    public Result<Integer> importConfigs(List<SystemConfig> configs, boolean override) {
        try {
            int successCount = 0;
            
            for (SystemConfig config : configs) {
                if (!override && exists(config.getConfigKey())) {
                    continue; // 跳过已存在的配置
                }
                
                if (configManager.setConfigValue(config.getConfigKey(), config.getConfigValue())) {
                    successCount++;
                }
            }
            
            logger.info("配置导入完成: 成功{}个, 总计{}个", successCount, configs.size());
            return Result.success("配置导入完成", successCount);
            
        } catch (Exception e) {
            logger.error("导入配置异常", e);
            return Result.error("导入配置异常: " + e.getMessage());
        }
    }
    
    @Override
    public Result<Boolean> validateConfigValue(String key, String value) {
        try {
            // 简单的验证逻辑
            if (StrUtil.isBlank(key)) {
                return Result.error("配置键不能为空");
            }
            
            if (value == null) {
                return Result.error("配置值不能为null");
            }
            
            // 这里可以根据具体的配置类型进行更详细的验证
            
            return Result.success("配置值验证通过", true);
            
        } catch (Exception e) {
            logger.error("验证配置值异常: key={}", key, e);
            return Result.error("验证配置值异常: " + e.getMessage());
        }
    }
    
    @Override
    public Result<Boolean> resetToDefault(String key) {
        try {
            SystemConfig config = getConfigEntity(key);
            if (config != null && StrUtil.isNotBlank(config.getDefaultValue())) {
                boolean result = configManager.setConfigValue(key, config.getDefaultValue());
                
                if (result) {
                    logger.info("配置重置成功: key={}", key);
                    return Result.success("配置重置成功", true);
                } else {
                    return Result.error("配置重置失败");
                }
            } else {
                return Result.error("配置不存在或无默认值");
            }
            
        } catch (Exception e) {
            logger.error("重置配置异常: key={}", key, e);
            return Result.error("重置配置异常: " + e.getMessage());
        }
    }
    
    /**
     * 创建模拟配置
     */
    private SystemConfig createMockConfig(String key, String value, String name, String type) {
        SystemConfig config = new SystemConfig(key, value, name, type);
        config.setDescription(name);
        config.setStatus("ENABLED");
        return config;
    }
}
